KR0178585B1 - Corner processing method of wire cut electric discharge machine - Google Patents

Abstract

The present invention relates to a corner processing method of a wire cut electric discharge machine, and when a chamfer is input between two consecutive straight blocks, inputting only the chamfer amount automatically calculates the start and end points of the chamfer block according to the chamfer amount. Not only can you perform, but you only need to enter the amount of chamfers so that you can easily modify the part program.

Description

Corner processing method of wire cut electric discharge machine

1 is a view showing a shape to be chamfered.

2 is a view showing a chamfer shape for explaining a conventional chamfering method.

3 is a flowchart of a corner processing method of a conventional wire cut electric discharge machine.

4 is a diagram illustrating a chamfer shape for explaining a method for calculating a start point and an end point of a chamfer block according to the present invention.

5 is a flowchart of a corner machining method of the wire cut electric discharge machine according to the present invention.

The present invention relates to a corner processing method of a wire cut electric discharge machine, and in particular, to set a chamfer between two consecutive straight line blocks, the corner of a wire cut electric discharge machine automatically sets the chamfer shape according to the set chamfer amount. It relates to a processing method.

Generally, a wire cut electric discharge machine is an apparatus which processes the contour of a specific shape to a workpiece | work by discharging between a wire and a to-be-processed object while winding a thin wire, such as copper or tungsten, as an electrode, and winding this wire in tension.

That is, the wire cut electric discharge machine applies a pulse voltage between the thin wire electrode and the workpiece of 0.05 to 0.3 mm, generates an electric discharge through the processing liquid, and the workpiece is melted by the energy at this time. It is a device to process. At this time, the wire electrode maintains a proper gap with the workpiece, thereby achieving stable discharge.

When machining a workpiece using such a wire cut electric discharge machine, it is necessary to create an NC program for machining, which is a command for a machine consisting of letters, numbers and symbols. These instructions are separated by the symbol of End of Block (CR), and a single instruction between the EOB and the EOB is called a block. For example, G00 X15.0 y-12.5 indicates a command to move rapidly at the same time as one block 16.0 mm in the X-axis + direction and 12.5 mm in the Y-axis-direction.

However, in the case of machining according to NC programming using a wire cut electric discharge machine, there is often a need to perform chamfering at a corner portion between two consecutive straight blocks.

That is, FIG. 1 shows a machining shape to be chamfered using a wire cut electric discharge machine, and shows that the straight block a and the straight block b are continuous, and that the chamfer is to be meandered between the straight block a and the straight block b. It is. At this time, C3 indicates to chamfer each 3mm from the corner where the a and b linear blocks meet.

The machining program for machining the two consecutive straight line blocks a and b is as follows.

G01 X10; ‥‥‥ Block a program

G01 Y-10; ‥‥‥ Block b program

Here, G01 means a straight cut, and X10 and Y-10 indicate a position, which indicates 10 mm in the X-axis + direction and 10 mm in the Y-axis direction. In the wire cut electric discharge machining, the X axis and the Y axis represent plane movement axes of the machining table.

On the other hand, when writing a program, there are two methods of displaying a position, an incremental method and an absolute method. An incremental method indicates a target position of a motion, which is represented by a movement amount from a position where a tool (ie, a wire) is located to a movement target position. The absolute method is to indicate the target position of the motion, which is expressed in one coordinate system from the origin of the coordinates. Therefore, in absolute mode, the origin of the coordinates must be instructed to the machine. In the embodiment of the present invention, the NC program is represented in an incremental manner.

As illustrated in FIG. 1, when the chamfer block c is inserted between the continuous straight blocks a and the straight blocks b according to the chamfer amount C3, the chamfer block c may be illustrated as shown in FIG. 2.

In this way, when the chamfer block c is to be inserted between the linear block a and the linear block b, the user must input a shape in consideration of the chamfer amount C3 into the part program in advance.

For example, a conventional machining program for machining a shape in which a chamfer block c is inserted between two consecutive straight line blocks a and b is as follows.

G01 X7; ‥‥‥ Block a program

G01 X10 Y-3; ‥‥‥ Block c program

G01 Y-10; ‥‥‥ Block b program

Here, the program of the block a is changed, and the program of the block c is inserted. For this purpose, the user has to calculate the start point (1) and the end point (2) of the chamfer block c conventionally in consideration of the amount of chamfering, and in this case, If a mistake occurs, the correct chamfer cannot be performed. That is, the block a is changed to G01 X (10-3) = X7 by the C3 chamfer to command cutting to the chamfer starting point (1), and then cut to the end point (X10, Y-3) and then according to the block b. It cuts to -10mm on the Y axis.

3 is a flowchart of a corner processing method of a conventional wire cut electric discharge machine, the corner processing method of a conventional wire cut electric discharge machine, comprising: setting a chamfering amount (100); Calculating 101 a starting point of the chamfer block; Calculating 102 an end point of the chamfer block; Modifying a part program in accordance with a start point and an end point of the chamfering block (103); Starting 104 machining according to the machining program; Reading 105 a block; Interpreting the read block (106); Calculating an end point of the block (107); Generating 108 a movement instruction of the block; If it is not determined by determining whether the machining program has ended, the process proceeds to step 109 of performing step 105 above.

That is, when the chamfer amount is set, the user calculates the start point of the chamfer block, modifies the program of the block a, and then calculates the end point of the chamfer block c, and adds the program of the inserted chamfer block c to the part program.

When the machining program is completed in this manner, machining starts.

When machining starts, it reads from the first block of the part program, analyzes the block, calculates the end point of the block, and generates a movement command from the current point and the calculated end point. This flow repeats until the end of the part program.

However, the conventional corner cutting method of the wire cut electric discharge machine is not only prone to mistakes in calculation as the user must calculate the start point and the end point of the chamfering block, but also has a troublesome problem of modifying the program of two blocks.

Therefore, the present invention is to solve the above problems of the conventional, to provide a corner cutting method of the wire cut electric discharge machine that can perform the accurate chamfer by automatically calculating the starting point and the end point of the chamfer block if only the chamfer amount is input. Its purpose is.

The corner cutting method of the wire cut electric discharge machine according to the present invention for achieving the above object is, in the wire cut electric discharge machine for processing the workpiece according to the instructions of the machining program after reading the machining program in block units, the amount of chamfering Setting a part to modify the part program; Reading a first block from the machining program when machining starts; Interpreting the read first block to determine whether there is a chamfer command (C); If there is a chamfer instruction, storing the chamfer amount in a memory and calculating an end point of the first block according to a predetermined equation; Instructing movement to the calculated endpoint; Determining whether the chamfer amount is stored in the memory after reading the second block, and if the chamfer amount is stored, calculating an end point of the chamfer block for the chamfer according to a predetermined equation; And clearing the chamfer amount stored in the memory after instructing the movement to the calculated end point, if there is a chamfer instruction in the first block, the end point of the first block (the start point of the chamfer block) and the end point of the chamfer block for the chamfer. It is characterized by being able to automatically calculate the chamfering process.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

Before describing the corner processing method of the wire cut electric discharge machine according to the present invention, a method of calculating the starting point and the end point of the chamfer block from the chamfer amount according to the present invention will be described first.

4 is a view illustrating a chamfer shape for explaining a method of calculating a start point and an end point of a chamfer block according to the present invention.

G01 X10 Cm;

G01 Y-10;

And the method of obtaining the start point (1) and the end point (2) of the chamfer block c from the chamfer amount Cm as described above is as follows.

Each linear block can be represented by a vector having an X-direction component and a Y-direction component at the origin of the X, Y coordinate system. Therefore, the linear block a is called 'A vector', the X and Y coordinate components of the A vector are called Ax and Ay, and the chamfer block c is called 'C vector', and the X coordinate component of the C vector. When the and Y-coordinate components are Cx and Cy, X components Cx and Y components Cy of the C vector are obtained from the chamfering amounts Cm using the following equations (1) and (2).

After the X component and the Y component of the C vector are obtained as described above, the starting point 1 of the chamfer block c is obtained by using Equations 3 and 4.

X component of the starting point (1) of the chamfer block c = Ax-Cx

Y component of the starting point (1) of the chamfer block c = Ay-Cy ‥‥‥

That is, the starting point 1 of the chamfer block c is the position A minus the C vector.

In addition, the end point 2 of the chamfer block c can also be obtained in the same manner as described above with the straight block b as the 'B vector'.

On the other hand, Figure 5 is a flow chart of the corner processing method of the wire cut electric discharge machine according to the invention, the step of setting the chamfering amount (201); Modifying the machining program according to the set chamfering amount (202); Starting the machining according to the machining program (203); Reading 204 a block; Interpreting the read block (205); Determining 206 whether the chamfer amount C has been stored; Loading (207) the value of the chamfer if the chamfer (C) is stored in step 206; Calculating an end point of the chamfer block according to a predetermined equation (208); Generating 209 a movement instruction of the chamfer block; Clearing the value of the stored chamfer amount C and performing step 206; Determining whether the chamfer amount C is input to the current block if the chamfer amount C is not stored in step 206; If the chamfer amount C is input in step 211, storing 212 the chamfer amount C; Calculating an end point of the current block according to a predetermined equation (213); Generating (214) a movement instruction of the current block; It is determined whether the machining program has ended, and if not, step 204 is performed.

Next, the operation and effect of the corner processing method of the wire cut electric discharge machine according to the present invention as described above in detail as follows.

If you set the chamfer amount to 3, the user enters the chamfer amount in the part program. For example, a modified program for the machining shown in FIG.

G01 X10 C3; 1st block

G01 Y-10; It becomes a 2nd block.

When the machining program is completed in this manner, machining starts. At this time, the machining reads the first block and analyzes it, and since the chamfer command C3 is inserted, the start point of the chamfer block is obtained, and then the second block is read to calculate the end point of the chamfer block, and then the chamfer block is performed. After that, the second block command is executed.

When machining is started, the block is read by reading from the first block of the machining program. In step 206, it is determined whether the chamfer amount C is stored in the memory.

In this case, since the chamfer amount is not stored in the memory when the first block is input, it is determined whether the chamfer amount is input to the current block (ie, the first block) in step 211. If there is a chamfer amount in the current block (first block), the chamfer amount is stored in the memory, and the end point (start point of the chamfer block) of the current block (first block) is calculated according to the above equations (1) through (4).

In step 214, the movement command of the current block is generated and output from the start point and the end point of the current block. If it is determined that the machining program has ended, the process returns to step 204 and the second block is read.

After analyzing the second block, it is determined whether the chamfer amount C is stored in the memory. In this case, since the chamfer amount C is stored in the memory in the first block, the end point of the inserted chamfer block is calculated after loading the chamfer amount C stored in the memory.

Then, a movement command of the chamfer block is generated and output from the start point of the chamfer block (end point of the first block) and the end point of the chamfer block, and then the chamfer amount stored in the memory is deleted.

In step 206, it is determined whether the chamfer amount is stored in the memory. Since the chamfer amount was deleted in step 210, the chamfer amount is not stored in the memory. Then, since there is no chamfer amount in the current block (ie, the second block), the end point of the current block (second block) is obtained according to a predetermined equation in step 213.

After generating and outputting the movement command of the current block (second block) from the start and end points of the current block (second block), it is determined whether the part program is terminated. Repeat the process of interpreting the block.

As described above, according to the present invention, when chamfering is performed between two consecutive straight blocks, if only the chamfering amount is input, the starting point and the end point of the chamfering block according to the chamfering amount are automatically calculated according to a predetermined equation, and the correct chamfering is performed. Not only can this be done, it is also easy to modify the part program by entering only the chamfer amount. And even if you want to change the amount of chamfers, it is easy to modify the part program because only the chamfer amount needs to be changed.

Claims (1)

A wire cut electric discharge machine for machining a workpiece according to a command of a machining program after reading and analyzing the machining program in block units, the method comprising: modifying a machining program by setting a chamfering amount; Reading a first block from the machining program when machining starts; Interpreting the read first block to determine whether there is a chamfer command (C); If there is a chamfer instruction, storing the chamfer amount in a memory and calculating an end point of the first block according to a predetermined equation; Instructing movement to the calculated endpoint; Determining whether the chamfer amount is stored in the memory after reading the second block, and if the chamfer amount is stored, calculating an end point of the chamfer block for the chamfer according to a predetermined equation; And clearing the chamfer amount stored in the memory after instructing the movement to the calculated end point, if there is a chamfer instruction in the first block, the end point of the first block (the start point of the chamfer block) and the end point of the chamfer block for the chamfer. Corner cutting method of the electric wire cut electric discharge machine, characterized in that it can automatically calculate the chamfering process.